Governor



April 19, 1938. H. c. REYNOLDS r AL GOVERNOR med may 1a, 1937 MNHN@ 0$| IN E vu RN Q@ NW oYM E @uw 1 MEW.. m a @my w. www m W\il A N. und-- @W 1mm M 1 @STN Mw www w mw n@ M ww D bmw rarement Apr. 19, 193s 2,114,813

Nrn-:D STATES PATENT OFFICE GOVERNOR Hai-01a c. Reynolds and Francis a. Jimerson,

Athens, Pa., asslgnors to Ingersoll-Rand Comany, `lersey City, N. .11., a corporation of New ersey Application May 1s, 1937, serial No. 143,281) a claims. (ci. 264-) This invention relates togoverning mechathe vanes 28. The exhaust fluid passes from the nisms. and more particularly to a governor used chamber 26 through ports 36 in the cylinder 25 in connection with pressure fluid actuated rotary and an exhaust port 31 in the casing 2|. motors for controlling the supply oi pressure The ow of pressure fluid through the passage uid thereto. 32 is controlled by a throtle valve 38, and the A few of the bjects of the invention are to admission of pressure uid to the motor is consimplify the construction of governors of this trolled by a valve 39 slidable in a valve chestl 40 character, to render the governor sensitively rearranged in the head 24 and coaxally with the sponsive to variations in the speed of the motor passage 32. The valve chest 48 is bored to prowhereby the governor is actuated, to enable the vide a valve chamber il of which an end is in governor to be readily adjusted in accordance direct communication with the supply passage with immediate speed requirements, and to en- 32, and in the side of the valve chest is a port able the governor to be conveniently and expet2 to afr'ord communication between the valve ditiously assembled and disassembled. chamber 4I and the passage 34.

Other objects will be in part obvious and in The port 42 is controlled by the valve 39 and part pointed out-hereinafter. the end of the valve adjacent the port 42 con- 1n the drawing accompanying this speciiication stitutes a pressure surface 43 against which presand in which similar reference numerals refer sure fluid acts. The opposite end of the valve to similai parts, carries a. stem 44 which extends slidably through Figure 1 1s a longitudinal view, in section, of a bore 45 in the valve chest 48 and into a cavity the governor vand a motor to which the governor 46 in the head 24. The valve 39 is a pressure is applied, balanced valve except for the cross sectional area Figure 2 is a longitudinal side elevation of the of the stem 44, since the pressure uid is free to governor showing the position which the parts act on both sides of the valve; and, consequently, will assume when the governor is at rest, the pressure fluid constantly acts on the un- Figure 3 is an end view of the governor, and balanced stem area to hold the valve in position Figure 4 is a longitudinal elevation, in section, for uncovering the port. of the governor and an element controlled Any suitable means, such as a spring ring 41, thereby. may be placed in the valve chamber 4I to retain Referring more particularly to the drawing, the valve 39 in the valve chamber. designates, in general, a governor constructed in The governor 28 constructed in accordance accordance with the practice of the invention with the practice of the invention comprises a and 21 a motor to which the governor 20 is applate 48 located in the cavity 46 and seats against plied; the endvof the rotor 21. TheV plate carries a The motor 2| is illustrated as being of the stem 49 which is threaded into the rotor, and hand held rotary type commonly used for actuextending coaxially through the stem and the ating a grinding Wheel and similar devices (not plate is a bore 50 to accommodate a rod 5l. The shown). The motor comprises a casing 22 suitrod is slidable in the bore 50 and has a head 52 ably connected toend heads 23 and 24. The casin which is embedded a ball 53 forming a seat ing encircles a cylinder 25 which, in the present for the free, end of the valve stem 44. The oppoinstance, is clamped between the heads 23 and site end of the rod 5I extends into the rotor 21 2t by the casing 22. The interior of the cylinder and a spring 54 encircling it seats with one end 25 forms a chamber 26 for a rotor 21 carrying against the stem 49 and with the other end slidable vanes 28 against which pressure fluid acts against a nut 55 threaded on the rod to exert a for rotating the rotor and the parts connected force for pressing the head 52 against the plate 48. thereto, as for example, a spider 29 forming a. The head 52 is of smaller diameter than the carrier for planetary gearing 38 which in turn plate 48 and between the peripheries of the head is connected to a shaft 3l upon which the grindand the plate are weights 56 adapted to be actuing wheel may be mounted. ated centrifugally for actuating the head 52 and Theapressure iluid used for actuating the rothus the valve 39. The weights 56 are of subtor 21 is conveyed thereto by a supply passage 32 stantially L-shape. They seat uponA the junction extending thorugh a handle 33, thence passes of plate 48 and fingers 68 and have arms 51 through a passage 34 in the head 24 and the cylwhich engage the head 52 for shifting the valve inder 25 and through admission ports 35 in the 39. cylinder into the chamber 26 where it acts against The mass or weight portions 58 of the Weights 56 may be of substantially the same height as the head 52 which they parallel when the rotor is at rest. 'Ihey taper outwardly from the free ends thereof and are provided with grooves 59 which incline in substantially the same degree as the outer surfaces of the weights and engage extensions or fingers 60 on the plate 48 to prevent relative rotation between the weights and the plate 48.

At the juncture of the bottoms 6| of the grooves 59 and the lower surfaces 62 of the weights are fulcra 63 in the form of knife edges which seat in the corners defined by the plate and the fingers 60. i

The operation of the device, briefly described, is as follows: With the throttle valve 88 in the open position pressure uid will flow from the supply passage 32 through the port 42 and associated ports and passages into the chamber 26 and actuate the rotor 21.

During the initial starting of the rotor the centrifugal force of the weights 56 is of insufficient value to affect the position of the valve 39. The port 42 will, therefore, be fully uncovered and the rotor will accelerate rapidly. When the rotor speed reaches a rate at which the centrifugal force of the weights 56 may overcome the force exerted by the spring 54 the valve 39 is actuated by the head 52 to partly cover the port 42 and thus diminish the supply of pressure fluid to the chamber 26.

If, owing to an increased resistance to the rotary movement of the motor, the speed of the motor is reduced the centrifugal force of the weights 56 will, of course, be correspondingly reduced and the spring 54 will then act to move the head 52 toward the plate 48. The pressure fluid acting against the actuating surface 43 will, at the same time, cause the valve 39 to follow the movement of the head 52 and thereby afford a wider area of communication between the valve chamber 4| and the passage 34 to again accelerate the speed of the motor.

In practice the present invention has been found to be a highly satisfactory governing device for use in connection with light Weight portable rotary tools in which it is essential that the overall weight of the tool be maintained at a minimum and in consequence of which only restricted space is available for the governing device. The parts comprising the governor are of simplified design and may, therefore, be cheaply replaced and quickly and conveniently assembled and disassembled.

We claim:

l. In a rotary governor for a non-rotating reciprocating valve, a. spring pressed reciprocating shaft, a head on the shaft, a bearing on the head to bear against the valve, a rotary plate to guide,

the shaft, fingers extending from the plate, tilting centrifugal weights having grooves in the outer surfaces thereof to co-act with the fingers to limit tilting movement of the weights and to prevent relative rotary movements between the plate and the weights, knife edge fulcra on the weights'resting on the juncture of the plate and fingers, and arms on the weights to impart longitudinal movement to the reciprocating shaft upon movement o1' the weights due to centrifugal force to thereby move the valve.

2. In a rotary governor for a non-rotating reciprocating valve, a spring pressed reciprocating shaft, a head on the shaft, a bearing on the head to bear against the head, a rotary plate to guide the shaft, fingers extending perpendicularly from the plate and forming fulcra surfaces at points of intersection with the plate, tilting centrifugal weights having grooves in the outer surfaces thereof to co-act with the fingers to limit tilting movement of the weights1 and to prevent relative rotary movement between the plate and the weights, knife edge fulcra on the weights resting on said fuicra surfaces forming pivot points on the weights and arms on and extending perpendicularly from the weights and resting between the plate and head to impart longitudinal movement to the reciprocating shaft upon movement of the weights due to centrifugal force to thereby move the valve.

HAROLD C. REYNOLDS. FRANCIS A. JIMERSON. 

